Host–Guest Inversion Engineering Induced Superionic Composite Solid Electrolytes for High‑Rate Solid‑State Alkali Metal Batteries (IMAGE)
Caption
- Host–guest inversion engineering is proposed to create poly(vinylidene fluoride-hexafluoropropylene) (PVH)-in-SiO2 composite solid electrolytes with an original “polymer guest-in-ceramic host” architecture, exhibiting optimized interfacial contacts and comprehensive properties.
- The PVH-in-SiO2 exhibits an overwhelming ionic conductivity of 1.32 × 10−3 S cm−1 at 25 °C, with an ultralow residual solvent content of 2.9 wt%. In addition, the LiFePO4|PVH-in-SiO2|Li full cells deliver a significant capacity retention of 92.9% at an ultrahigh rate of 3C after 300 cycles at 25 °C.
- The host–guest inversion engineering is a versatile strategy, as proved by preparing Na+ and K+-based PVH-in-SiO2 composite solid electrolytes, delivering excellent ionic conductivity of 10−4 S cm−1 at 25 °C (vs. 10−6–10−5 S cm−1 of previous reports).
Credit
Xiong Xiong Liu, Long Pan*, Haotian Zhang, Pengcheng Yuan, Mufan Cao, Yaping Wang, Zeyuan Xu, Min Gao, Zheng Ming Sun*
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CC BY-NC-ND